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We used to live 1000 ft from Tesla HQs at the Stanford Industrial Park. We moved to Honolulu from the Bay Area 16 months ago. Our first electricity bill was $488 month. HECO, the utility company charges 33 cents per kWh, and all the plants are diesel-fueled. We had SolarCity installed 41 PVs and the bill went to $17/month. I already saved $6,500 plus 2,500 kWh in the bank.

I then ordered a Tesla Model S which is expected to come in May. The excess electricity generated by PVs will be more than sufficient to keep the Model S charged without drawing on the grid. This means we do not need to line up for gas, and saved $80/week!

The following is our projected savings by 2032 (PVs are guaranteed for 20 years)

Electricity $189K

Model S $121K

NPV AT 5% Discount = $135K

Internal Rate of Return = 38%

I have a spreadsheet if anyone wants it. Please email me at joseph2ng@gmail.com